Method for reducing driveline vibration in a hybrid electric vehicle powertrain
AssigneeFord Global Technologies, LLC
InventorsFazal Syed, Ming Kuang, John Czubay, Paul Niessen
Life of this patent
Estimating the term…
Abstract
A method is disclosed for managing torque distribution in a hybrid electric vehicle powertrain. An engine power estimation is determined for use in obtaining an optimum wheel torque command to attenuate sustained powertrain dynamic oscillations during operation of the vehicle with varying wheel torque and speed.
Claims13
A method for attenuating dynamic oscillatory inertia torque disturbances in a powertrain for a hybrid electric vehicle, the powertrain having a first power source comprising an engine, a second power source comprising an electric motor electrically coupled to a battery and a generator, and gearing establishing a mechanical power flow path between the engine and the generator, the method comprising the steps of:
- determining a desired vehicle wheel torque and an engine speed command in response to a driver demand for driving torque;
- determining a generator torque command as a function of the engine speed command;
- determining a motor torque command as a function of the desired vehicle wheel torque and the generator torque command;
- calculating an engine power estimate as a function of desired vehicle wheel torque, motor torque command and generator torque command;
- and
- filtering the engine power estimate using a weighted filtering factor that is dependent upon motor speed to obtain a final engine power estimate whereby oscillatory torque disturbances in the powertrain are attenuated.
A method for attenuating dynamic oscillatory inertia torque disturbances in a powertrain for a hybrid electric vehicle, the powertrain having a first power source comprising an engine, a second power source comprising an electric motor electrically coupled to a battery and a generator, and gearing establishing a mechanical power flow path between the engine and the generator, the method comprising the steps of:
- determining a desired vehicle wheel torque and an engine speed command in response to a driver demand for driving torque;
- determining generator torque command as a function of the engine speed command;
- determining a motor torque command as a function of the wheel torque command desired and the generator torque command;
- determining motor speed;
- determining generator speed;
- calculating an engine power estimate as a function of the desired vehicle wheel torque, the motor torque command, the generator torque command, the motor speed and the generator speed;
- and
- filtering the engine power estimate using a weighted filtering factor that is dependent upon motor speed to obtain a final engine power estimate, whereby oscillatory torque disturbances in the powertrain are attenuated.
Dependencies are inferred from the claim text.